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Effect of Soil Amendments on as Uptake by Rice

S. Kaiser Zaman
Chief Scientific Officer
Soil Science Division, BRRI Gazipur

M Sajidur Rahman
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

S. M. Mofizul Islam
Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

Grain yield of BRRI dhan47 varied significantly due to the effect of soil amendments. The highest yield (6.50 t/ha) was demonstrated in the rice straw treatment followed by ash treated soil (6.30 t/ha). Except cow dung all the amendments showed significantly higher yield than inorganic fertilizer treatment. Similar to grain yield, grain As conc. and grain As uptake varied significantly due to the application of amendments. The highest grain As was found in poultry manure treated plot (1.24 mg/kg) and the lowest (0.43 mg/kg) was observed both in inorganic fertilizer and cow dung treatments. Grain As in rice straw and ash treatments were also significantly higher than inorganic fertilizer treatment. Similar pattern was observed in case of grain As uptake. However, the uptake was lowest in cow dung treatment (1.70 g/ha) among all the treatments. Further study is needed for confirmation of the results.

Keywords: Ash, Rice straw, As mitigation, Organic matter, Poultry manure

Location: BRRI farm Satkhira

Start Date: 01-07-2010

End Date: 30-06- 2011

Program Area: Crop-Soil-Water Management

Commodity: Land management

Objectives:

To explore suitable amendment that are locally available like ash and rice straw to reclaim As contaminated soil.

Methodology:

This experiment was set up at BRRI farm Satkhira during Boro 2010-11. The STW used for irrigation in the farm contained As-contaminated water (85 ppb). Four soil amendments, namely; cow dung @ 5 t/ha, poultry manure @ 2 t/ha, rice straw @ 2 t/ha and ash @ 5 t/ha were applied to see their effect on As uptake by BRRI dhan47. The experimental design was randomized complete block design with three replications. The unit plot size was 5 X 5 m2. Forty five days old seedlings were transplanted during early January. The rates of fertilizers were N, P, K, S and Zn @ 120-10-56-10-1 kg/ha from urea, TSP, MP, gypsum and zinc sulfate, respectively. The rate of inorganic fertilizer for the soil amendment treatments were calculated based on IPNS approach. All necessary intercultural operations were done as and when required. At maturity, the crop was harvested and grain and straw yields were recorded. Samples were dried and processed before digestion in tri-acid mixture for As-analysis. Irrigation water samples were collected during irrigation period and preserved for As analysis. Arsenic conc. in grain and water was determined by hydride generation-Atomic absorption spectrophotometer.

Source of Information: Proceedings of the BRRI Annual Internal Research Review, 2010- 2011

Article Link (Online Journal):

Funding Source:

1. Bangladesh Agricultural Research Council

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The highest grain As was found in poultry manure treated plot (1.24 mg/kg) and the lowest (0.43 mg/kg) was observed both in inorganic fertilizer and cow dung treatments.

Knowledge Management: Report/Proceedings